I worked for the Royal Bank of Scotland back in the early 2000's. The tellers had a seperate stack of money (1000 quid) which had dye in it and if we got robbed they were meant to give that to the robbers and it would explode as they went past a sensor at the front door and ruin all of the notes.Yep, the last of the crime gangs of the 70's before the gig was up with better security, and the advent of CCTV.
We had a new teller in the branch and in her first week she accidently gave that stack of notes in a envelope to a customer and it exploded in the foyer of the branch with dye covering everything.